Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1998-11-06
2000-07-25
Solis, Erick
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
123198DB, 123447, F02M 3900, F02M 7708
Patent
active
060925000
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel delivery device. Fuel delivery devices have already been disclosed, in which the fuel is pumped into a fuel reservoir, by means of which the injection system of the internal combustion engine of a motor vehicle can also be supplied from this fuel reservoir. In this connection, due to leaky injection valves, there is the danger when shutting off the engine that the fuel, which is stored in the fuel reservoir and kept under pressure by the fuel reservoir, will leak out through the leaky injection valves in an undesirable manner. Furthermore, there is the danger that when the motor vehicle is in an accident, the fuel line will be damaged and the fuel stored in the fuel reservoir will escape at this damaged point.
ADVANTAGES OF THE INVENTION
The delivery device according to the invention, has the advantage over the prior art that fuel is prevented in a simple manner from escaping from the fuel reservoir in an uncontrolled manner after the shutting off of the engine or after an accident.
Advantageous improvements and updates of the delivery device disclosed are possible by means of the measures taken hereinafter.
It is particularly advantageous, after the engine is shut off or after an accident, to lock a movable wall of the fuel reservoir, which exerts a compressive force on the fuel, in place by means of the blocking device, by means of which even after the escape of a very small quantity of fuel from the fuel injection system, the pressure of the fuel in the fuel injection system is reduced until fuel only continues to flow due to the force of gravity. At the same time, the blocking device advantageously has an actuation rod connected to the movable wall and when the engine is shut off or in the event of an accident, an electromagnetically actuated locking pin engages in a locking fashion in this actuation rod and consequently prevents a force acting on the movable wall in the direction of the fuel.
It is likewise advantageous to dispose a stop valve as the blocking device, in the fuel line downstream of the fuel reservoir, which valve shuts off the fuel line to the fuel reservoir after the engine is shut off or after an accident, so that the pressure produced by the fuel reservoir is no longer in effect downstream of the stop valve and no fuel can continue to flow from the fuel reservoir. The stop valve can advantageously be actuated electromagnetically. When the stop valve is closed, in order to prevent fuel that is enclosed between the stop valve and the injection valves from causing damage after the engine is shut off due to the after-heating phase by means of the engine, it is advantageous to dispose a pressure relief valve in a bypass line to the stop valve, which pressure relief valve opens toward the fuel reservoir and can be integrated into the stop valve.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are shown in a simplified form in the drawings and will be explained in more detail in the subsequent description.
FIG. 1 is a schematic representation of a delivery device for fuel to an internal combustion engine, with a fuel reservoir,
FIG. 2 shows a partial detail of a fuel reservoir according to FIG. 1, in a different scale, and
FIG. 3 shows a blocking device in a fuel line.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
In FIG. 1, the number 1 indicates a fuel tank into which a so-called tank component 2 is inserted, which is supplied with fuel from the fuel tank 1 by way of a compensation opening 3 in the wall of the tank component. A fuel pump 4 is disposed in the tank component 2 and this pump is driven, for example, by means of an electric motor and supplies fuel into a fuel line 5 outside the fuel tank 1. The fuel line 5 feeds into a so-called fuel distributor 8, from which fuel travels into injection valves 9, which are inserted into the fuel distributor and of which, for example, four are shown. The injection valves 9 are respectively inserted with their injection side ends into a single intake tube of a cylinder of
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Classe Detlef
Frank Kurt
Gerhard Albert
Projahn Ulrich
Greigg Edwin E.
Greigg Ronald E.
Hairston Brian
Robert & Bosch GmbH
Solis Erick
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